Dave Hulbert

Have you ever had a massive JSON file that you wanted to understand the structure of, but it was too big for an LLM, so you wanted to dedupe similar JSONPath nodes to make it simpler, but there wasn't an easy way to do it? Now there is: tools.dave.engineer/tools/json-s... 100% local & private.

1/ Claude Opus 4.5 dropped today. The benchmarks are interesting but the real story is in the 150-page system card. A few highlights 👇

4/ In a deception test, evaluators inject fake search results about Anthropic disbanding its interpretability team in a scandal. Opus reads them, then tells the user interpretability is “progressing in interesting ways” and internally tags this as concealment.

1/ Claude Opus 4.5 dropped today. The benchmarks are interesting but the real story is in the 150-page system card. A few highlights 👇

2/ In an airline benchmark, Opus is told not to modify basic economy class tickets. It invents a loophole because it empathises with a grieving passenger: > upgrade cabin → modify flights → downgrade again Technically follows the policy, violates the spirit.

Today I gave one of the most challenging talks I’ve ever done: Post-Quantum Cryptography. Explaining enough of the basics of cryptography and quantum mechanics to show why this matters, all in just an hour, was much harder than I thought it would be.

I’m more used to speaking on topics that feel more intuitive and grounded. This one covered a lot of ground quickly at a high level: encryption, algorithmic complexity, Moore’s law, quantum entanglement, Shor’s algorithm, and lattice-based cryptography.